CN109546334B - Low-profile cross oscillator for multi-frequency base station antenna - Google Patents
Low-profile cross oscillator for multi-frequency base station antenna Download PDFInfo
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- CN109546334B CN109546334B CN201811281337.9A CN201811281337A CN109546334B CN 109546334 B CN109546334 B CN 109546334B CN 201811281337 A CN201811281337 A CN 201811281337A CN 109546334 B CN109546334 B CN 109546334B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
Abstract
The invention discloses a low-profile cross-shaped oscillator for a multi-frequency base station antenna, which comprises a horizontal feed dielectric plate, two vertical feed dielectric plates and four antenna oscillator arms, wherein the two vertical feed dielectric plates are respectively a-45-degree vertical feed dielectric plate and a + 45-degree vertical feed dielectric plate, two notches matched with the oscillator arms are respectively formed at two sides of the upper end of each vertical feed dielectric plate, a channel matched with the thickness of the vertical feed dielectric plate is formed at one end part of each antenna oscillator arm, one end of each antenna oscillator arm is clamped in the notch of the vertical feed dielectric plate, the notch of the vertical feed dielectric plate is also clamped in the channel at the end part of the antenna oscillator arm, a micro-strip circuit is arranged on the front surface of the horizontal feed dielectric plate, and a cross-shaped groove matched with the two vertical feed dielectric plates is formed on the horizontal feed dielectric plate. The cross section of the radiation arm is relatively small, and the shielding of the high-frequency oscillator can be effectively reduced, so that the interference to the high-frequency oscillator is reduced.
Description
Technical Field
The invention relates to a vibrator, in particular to a low-profile cross-shaped vibrator for a multi-frequency base station antenna.
Background
With the development of mobile communication technology, people have higher and higher requirements on communication speed, so that the deployment and application of wireless communication systems in different frequency bands are more and more, and the space on a communication iron tower is more and more limited. In order to effectively reduce the installation space of the antenna on the iron tower, the multi-frequency antenna needs to be developed. However, integrating multiple frequency band antenna elements in a limited antenna space will bring great difficulties to antenna design, such as interference between antenna elements in different frequency bands. In order to effectively reduce the interference between the antenna oscillators in different frequency bands, the oscillator is designed in a low section so as to reduce the shielding of the oscillator on other oscillators. The low frequency oscillator in the existing scheme often adopts a full-metal or full-dielectric-plate structure, so that the size of the antenna is large, the shielding phenomenon between the antenna and the high frequency oscillator is serious, and the interference between the antenna and the high frequency oscillator is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-profile cross-shaped oscillator for a multi-frequency base station antenna, and reducing the shielding of a high-frequency oscillator.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a low-profile cross-shaped oscillator for a multi-frequency base station antenna is characterized in that: the antenna comprises a horizontal feed dielectric slab, two vertical feed dielectric slabs and four antenna oscillator arms, wherein the two vertical feed dielectric slabs are a-45-degree vertical feed dielectric slab and a + 45-degree vertical feed dielectric slab respectively, the surfaces of the two vertical feed dielectric slabs are provided with first microstrip circuits for coupling feed and impedance matching, the middle position of the upper end of the + 45-degree vertical feed dielectric slab is provided with an upper groove which is downwards arranged along the vertical direction, the middle position of the lower end of the 45-degree vertical feed dielectric slab is provided with a lower groove which is upwards arranged along the vertical direction, the upper groove and the lower groove are mutually matched and clamped, the length of the upper groove and the length of the lower groove are matched with the length of the vertical feed dielectric slab, two sides of the upper end of the two vertical feed dielectric slabs are respectively provided with a notch matched with the oscillator arms, one end part of each antenna oscillator arm is provided with a channel matched with the thickness of the vertical feed dielectric slab, one end of the antenna oscillator arm is clamped in a notch of the vertical feed dielectric plate, the notch of the vertical feed dielectric plate is also clamped in a channel at the end part of the antenna oscillator arm, the front surface of the horizontal feed dielectric plate is provided with a second microstrip circuit, the horizontal feed dielectric plate is provided with a cross-shaped groove matched with the two vertical feed dielectric plates, and the two vertical feed dielectric plates are inserted and fixed in the cross-shaped groove.
Furthermore, the end part of the antenna oscillator arm is directly welded and fixed with the vertical feed dielectric plate.
Furthermore, the notch of the vertical feed dielectric plate is a square notch, and two round holes for welding are arranged at two ends of one side edge of the square notch, which is positioned at the inner side of the vertical feed dielectric plate.
Furthermore, a convex feed structure and a first impedance matching section are arranged on one side face of the + 45-degree vertical feed dielectric slab, the convex feed structure comprises multiple feed sections, the adjacent feed sections at two ends are connected in an initial position and are arranged perpendicularly to each other to form a bottomless convex feed structure, and the first impedance matching section is arranged in the vertical direction and the upper end of the first impedance matching section is connected with one end of the convex feed structure.
Furthermore, a concave-shaped feed structure and a second impedance matching section are arranged on one side face of the-45-degree vertical feed dielectric slab, the concave-shaped feed structure comprises multiple sections of feed sections, the adjacent two end feed sections are connected in an initial position and are arranged perpendicular to each other to form a bottomless concave-shaped feed structure, the second impedance matching section is arranged in the vertical direction, and the upper end of the second impedance matching section is connected with one end of the concave-shaped feed structure.
Further, the connecting part of the lower end of the first impedance matching section or the second impedance matching section is widened.
Furthermore, the second microstrip circuit is a low-pass filter circuit, which comprises two microstrip lines symmetrically arranged on two sides of the front surface of the horizontal dielectric plate, each microstrip line comprises a bending connecting section, a middle section, a first L section, a second L section, a third L section, a fourth L section and a square connecting section, one end of the bending connecting section is connected with the lower end of the impedance matching section of the vertical feeding dielectric plate in the cross-shaped groove, the other end of the bending connecting section is connected with one end of the middle section, the other end of the middle section is connected with one end of the square connecting section, one end of the first L section is connected with one end of the middle section, the other end of the first L section is bent towards the other end of the middle section, one end of the fourth L section is connected with the other end of the middle section, the other end of the fourth L section is bent towards one end of the middle section, so that the first L section and the fourth L section are, the other ends of the second L section and the third L section are respectively bent towards the two ends of the middle section, so that the second L section and the third L section are in point symmetry structures.
Furthermore, the connecting part of one end part of the bent connecting section is widened.
Furthermore, the reverse side of the horizontal feed dielectric plate is respectively provided with a welding point on the side surface of the end part of the four groove edges of the cross-shaped groove.
Furthermore, the other side of the vertical feed dielectric plate opposite to the feeder line is a conductor part, the middle of the conductor is slotted to realize an antenna balun, the slotted width is larger than the slotted width of the vertical feed dielectric plate, a vertical connecting conductor is arranged in a lower groove of the + 45-degree vertical feed dielectric plate, and two ends of the vertical connecting conductor are respectively connected with the conductor parts at two sides of the slot of the + 45-degree vertical feed dielectric plate.
Compared with the prior art, the invention has the following advantages and effects:
1. the antenna radiation arm is composed of two pairs of slender metal rods, the cross section of the radiation arm is relatively small, and shielding of the high-frequency oscillator can be effectively reduced, so that interference to the high-frequency oscillator is reduced;
2. the current on the conductor at the bottom of the vertical dielectric plate can flow to the radiation arm well, so that the radiation efficiency of the antenna radiation arm and the standing wave matching effect of the antenna are guaranteed;
3. the coupling feed form and the broadband impedance match can effectively widen the bandwidth of the antenna;
4. conductor connection is carried out at the position of a slot at the bottom of a vertical feed dielectric plate, so that the isolation between polarizations can be improved;
5. the isolation between polarizations is improved by keeping the welding point of the cross-shaped groove away from the midpoint of the cross as far as possible;
6. widening treatment is carried out near circuit connection points on the vertical medium plate and the horizontal medium plate, so that welding can be facilitated and standing wave debugging is facilitated;
7. the low-pass filter is integrated on the horizontal medium plate, so that the high-frequency electromagnetic part can be filtered, and the isolation between high-frequency and low-frequency bands can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a low-profile cross-shaped element for a multi-frequency base station antenna of the present invention.
Fig. 2 is an exploded view of a low-profile cross element for a multi-frequency base station antenna of the present invention.
Fig. 3 is a schematic view of a vertical feed dielectric plate of the present invention.
Fig. 4 is a schematic view of a horizontal feeding dielectric plate of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
As shown in fig. 1 and 2, the low-profile cross-shaped oscillator for a multi-frequency base station antenna of the present invention comprises a horizontal feeding dielectric plate 1, two vertical feeding dielectric plates and four antenna oscillator arms 2, wherein the two vertical feeding dielectric plates are respectively a-45 ° vertical feeding dielectric plate 3 and a +45 ° vertical feeding dielectric plate 4, the surfaces of the two vertical feeding dielectric plates are respectively provided with a first microstrip circuit for coupling feeding and impedance matching, the middle position of the upper end of the +45 ° vertical feeding dielectric plate 4 is provided with an upper groove 5 which is downwards arranged along the vertical direction, the middle position of the lower end of the-45 ° vertical feeding dielectric plate 3 is provided with a lower groove 6 which is upwards arranged along the vertical direction, the upper groove 5 and the lower groove 6 are mutually matched and clamped, the lengths of the upper groove 5 and the lower groove 6 are matched with the length of the vertical feeding dielectric plate, both sides of the upper ends of the two vertical feeding dielectric plates are respectively provided with a notch 7 which is matched with the oscillator arms, the end part of one end of each antenna oscillator arm 2 is provided with a channel 8 matched with the thickness of the vertical feed dielectric plate, one end of each antenna oscillator arm 2 is clamped in a notch 7 of the vertical feed dielectric plate and the notch of the vertical feed dielectric plate is also clamped in the channel 8 at the end part of the antenna oscillator arm 2, the front surface of the horizontal feed dielectric plate 1 is provided with a second microstrip circuit, the horizontal feed dielectric plate 1 is provided with a cross-shaped groove 9 matched with the two vertical feed dielectric plates, and the two vertical feed dielectric plates are inserted and fixed in the cross-shaped groove 9. The antenna radiation arm is composed of two pairs of slender metal rods, so that +/-45-degree polarized radiation is formed, the cross section of the radiation arm is relatively small, shielding of the high-frequency oscillator can be effectively reduced, and interference to the high-frequency oscillator is reduced. The bottom of the vertical feed dielectric plate is in a wedge shape, so that the vertical feed dielectric plate can be vertically inserted into the cross-shaped groove of the horizontal dielectric plate.
The end part of the antenna oscillator arm 2 is directly welded and fixed with the vertical feed dielectric plate. The notch 7 of the vertical feed dielectric plate is a square notch, and two circular holes 10 for welding are arranged at two ends of one side edge of the square notch, which is positioned at the inner side of the vertical feed dielectric plate. By the welding mode, the current on the conductor at the bottom of the vertical dielectric plate can be ensured to flow onto the radiation arm well, so that the radiation efficiency of the antenna radiation arm and the standing wave matching effect of the antenna are guaranteed.
The first microstrip circuit structure is, as shown in fig. 3, a convex feed structure 11 and a first impedance matching section 12 are arranged on one side surface of the +45 ° vertical feed dielectric plate 4, the convex feed structure 11 includes a plurality of feed sections, the adjacent feed sections at both ends are connected in the first direction and are arranged perpendicular to each other to form a bottomless convex feed structure, the first impedance matching section 12 is arranged in the vertical direction, and the upper end of the first impedance matching section 12 is connected with one end of the convex feed structure 11.
A v-shaped feed structure 13 and a second impedance matching section 14 are arranged on one side surface of the 45 ° vertical feed dielectric plate 3, the v-shaped feed structure 13 comprises a plurality of feed sections, adjacent two end feed sections are connected in the first direction and are arranged perpendicular to each other to form a bottomless v-shaped feed structure, the second impedance matching section 14 is arranged along the vertical direction, and the upper end of the second impedance matching section 14 is connected with one end of the v-shaped feed structure 13. The concave-convex coupling feed form and the broadband impedance match can effectively widen the bandwidth of the antenna.
The connecting part of the lower end of the first impedance matching section or the second impedance matching section is widened. The widening treatment near the connecting point can facilitate welding and is beneficial to standing wave debugging.
As shown in fig. 4, the second microstrip circuit is a low-pass filter circuit, which includes two microstrip lines symmetrically disposed on two sides of the front surface of the horizontal dielectric plate, each microstrip line includes a bent connection section 15, an intermediate section 16, a first L section 18, a second L section 19, a third L section 20, a fourth L section 21, and a square connection section 17, one end of the bent connection section 15 is connected to the lower end of the impedance matching section of the vertical feeding dielectric plate in the cross-shaped groove 9, the other end of the bent connection section 15 is connected to one end of the intermediate section 16, the other end of the intermediate section 16 is connected to one end of the square connection section 17, one end of the first L section 18 is connected to one end of the intermediate section 16, and the other end of the first L section 18 is bent toward the other end of the intermediate section 16, one end of the fourth L section 21 is connected to the other end of the intermediate section 16, and the other end of the fourth L section 21, one end of the second L section 19 and one end of the third L section 20 are respectively connected with the middle part of the middle section 16, and the other ends of the second L section 19 and the third L section 20 are respectively bent towards the two ends of the middle section 16, so that the second L section 19 and the third L section 20 are in point symmetry structures. The low-pass filter is integrated on the horizontal medium plate, so that the high-frequency electromagnetic part can be filtered, and the isolation between high-frequency and low-frequency bands can be effectively improved. The connection part of one end part of the bending connection section 15 is widened. The widening treatment near the connecting point can facilitate welding and is beneficial to standing wave debugging.
The reverse side of the horizontal feed dielectric plate 1 is provided with a welding point 22 on the side of the end part of the four slot edges of the cross-shaped groove 9. The welds are located as far away from the cross-hair midpoint as possible to improve isolation between polarizations.
The other side of the vertical feed dielectric plate opposite to the feeder is a conductor part, the middle of the conductor is slotted to realize an antenna balun, the width of the slot is larger than the width of the slot of the vertical feed dielectric plate, a vertical connecting conductor 23 is arranged in the lower slot of the + 45-degree vertical feed dielectric plate, and two ends of the vertical connecting conductor are respectively connected with the conductor parts at two sides of the slot of the + 45-degree vertical feed dielectric plate. Conductor connection is carried out at the position of the bottom slot, so that the isolation between polarizations can be improved.
The low-profile cross-shaped oscillator for the multi-frequency base station antenna adopts a slender metal oscillator arm combined with a dielectric plate feed balun structure, and effectively reduces the shielding of a high-frequency oscillator on the basis of ensuring the bandwidth of a low-frequency antenna through a concave-convex coupling feed structure on the dielectric plate. In addition, the isolation among different polarizations of the oscillator is effectively improved by taking corresponding measures for the balun feed structure. Therefore, the method can be better applied to the multi-frequency antenna, and the interference among the oscillators in different frequency bands is reduced to a great extent.
The above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A low-profile cross-shaped oscillator for a multi-frequency base station antenna is characterized in that: the antenna comprises a horizontal feed dielectric slab, two vertical feed dielectric slabs and four antenna oscillator arms, wherein the two vertical feed dielectric slabs are a-45-degree vertical feed dielectric slab and a + 45-degree vertical feed dielectric slab respectively, the surfaces of the two vertical feed dielectric slabs are provided with first microstrip circuits for coupling feed and impedance matching, the middle position of the upper end of the + 45-degree vertical feed dielectric slab is provided with an upper groove which is downwards arranged along the vertical direction, the middle position of the lower end of the 45-degree vertical feed dielectric slab is provided with a lower groove which is upwards arranged along the vertical direction, the upper groove and the lower groove are mutually matched and clamped, the length of the upper groove and the length of the lower groove are matched with the length of the vertical feed dielectric slab, two sides of the upper end of the two vertical feed dielectric slabs are respectively provided with a notch matched with the oscillator arms, one end part of each antenna oscillator arm is provided with a channel matched with the thickness of the vertical feed dielectric slab, one end of the antenna oscillator arm is clamped in the notch of the vertical feed dielectric plate, the notch of the vertical feed dielectric plate is also clamped in the channel at the end part of the antenna oscillator arm, the front surface of the horizontal feed dielectric plate is provided with a second microstrip circuit, the horizontal feed dielectric plate is provided with a cross-shaped groove matched with the two vertical feed dielectric plates, and the two vertical feed dielectric plates are inserted and fixed in the cross-shaped groove; the second microstrip circuit is a low-pass filter circuit and comprises two microstrip lines which are symmetrically arranged on two sides of the front surface of the horizontal dielectric plate, each microstrip line comprises a bending connecting section, a middle section, a first L section, a second L section, a third L section, a fourth L section and a square connecting section, one end of the bending connecting section is connected with the lower end of an impedance matching section of the vertical feed dielectric plate in the cross-shaped groove, the other end of the bending connecting section is connected with one end of the middle section, the other end of the middle section is connected with one end of the square connecting section, one end of the first L section is connected with one end of the middle section, the other end of the first L section is bent towards the other end of the middle section, one end of the fourth L section is connected with the other end of the middle section, the other end of the fourth L section is bent towards one end of the middle section, so that the first L section and the fourth, the other ends of the second L section and the third L section are respectively bent towards the two ends of the middle section, so that the second L section and the third L section are in point symmetry structures.
2. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: and the end part of the antenna oscillator arm is directly welded and fixed with the vertical feed dielectric plate.
3. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: the notch of the vertical feed dielectric plate is a square notch, and two circular holes for welding are arranged at two ends of one side edge of the square notch, which is positioned on the inner side of the vertical feed dielectric plate.
4. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: the +45 perpendicular feed dielectric-slab side of one side is provided with protruding style of calligraphy feed structure and first impedance matching section, and protruding style of calligraphy feed structure contains the multistage feed section, thereby the first connection and mutually perpendicular setting constitute a protruding style of calligraphy feed structure of no end between the adjacent both ends feed section, and first impedance matching section sets up along vertical direction and first impedance matching section upper end is connected with protruding style of calligraphy feed structure's one end.
5. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: the side face of one side of the-45-degree vertical feed dielectric plate is provided with a concave feed structure and a second impedance matching section, the concave feed structure comprises a plurality of feed sections, the feed sections at two adjacent ends are connected in an initial position and are arranged vertically to each other to form a bottomless concave feed structure, the second impedance matching section is arranged in the vertical direction, and the upper end of the second impedance matching section is connected with one end of the concave feed structure.
6. A low-profile cross-shaped element for a multi-frequency base station antenna according to claim 4, wherein: the lower end connecting part of the first impedance matching section is widened.
7. A low-profile cross-shaped element for a multi-frequency base station antenna according to claim 5, wherein: the connecting part of the lower end of the second impedance matching section is widened.
8. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: the connecting part of the end part of one end of the bending connecting section is widened.
9. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: and welding points are respectively arranged on the side surfaces of the end parts of the four groove edges of the cross-shaped groove on the reverse surface of the horizontal feed dielectric plate.
10. A low-profile cross-shaped element for a multi-frequency base station antenna, as defined in claim 1, wherein: the other side of the vertical feed dielectric plate opposite to the feeder line is a conductor part, the antenna balun is realized by slotting in the middle of the conductor, the slotting width is larger than the slotting width of the vertical feed dielectric plate, a vertical connecting conductor is arranged in a lower slot of the + 45-degree vertical feed dielectric plate, and two ends of the vertical connecting conductor are respectively connected with the conductor parts on two sides of the slot of the + 45-degree vertical feed dielectric plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110165381A (en) * | 2019-06-10 | 2019-08-23 | 中天宽带技术有限公司 | A kind of low-frequency vibrator and multi-frequency array antenna |
| WO2021000176A1 (en) * | 2019-06-30 | 2021-01-07 | 瑞声声学科技(深圳)有限公司 | Antenna oscillator |
| CN110994198B (en) * | 2020-01-09 | 2021-10-15 | 广东健博通科技股份有限公司 | Antenna subarray |
| CN111029768A (en) * | 2020-01-09 | 2020-04-17 | 广东健博通科技股份有限公司 | Broadband dual-polarization radiating unit and large-scale array antenna |
| CN113437516B (en) * | 2021-06-29 | 2022-09-27 | 北京交通大学 | Large-frequency-ratio multi-frequency antenna and terminal |
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